Another First Order-RC circuits

RC circuits-
A 10 ohm resistor and 10 microfarad capacitor are attached in series to a 10 volt DC supply. If the current i(0)=1 ampere, what is the current after 0.1 milliseconds (0.0001 seconds)? Round in the thousandths place.

So I worked through this one so carefully! and I was sure I had the correct answer, but didn't! so this is what I did: